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> >1. why is the link to the information resource outside the metadata set? There seems to me to be a fundamental distinction between an identifier which allows you to distinguish between "equal" instances and a locator which allows you to access it. Making reference to a namespace adds indirection (and hence stability) but does not remove the problem, I think. It just replaces the locator by a pointer to the namespace in which resolution is achieved. We can resolve the issue implicitly by making assumptions about co-location (equal instances are not equivalent as they are in different locations) but I doubt if that is very satisfactory. ___________________________________________________________________________ Anthony Finkelstein (Prof.) | TEL: 44 171 380 7293 (Direct Dial) University College London | FAX: 44 171 387 1397 Dept. of Computer Science | EMAIL: [log in to unmask] Gower Street, | http://www.cs.ucl.ac.uk/staff/A.Finkelstein London WC1E 6BT | OFFICE: G20, Pearson Building United Kingdom | PGP Key on request ___________________________________________________________________________ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%